Finding the Third Proportional to 311,310 and 680,823.75

Step by Step Solution

1. Step 1: Write the proportion equation
   311,310 : 680,823.75 = 680,823.75 : x
2. Step 2: Convert to fraction form
   311,310/680,823.75 = 680,823.75/x
3. Step 3: Cross multiply
   311,310x = 680,823.75 × 680,823.75
4. Step 4: Simplify right side
   311,310x = 463,520,978,564.06
5. Step 5: Solve for x
   x = 463,520,978,564.06/311,310
6. Step 6: Final answer
   x = 1,488,937.00